Malicious PDF — malware analysis report

Static analysis result for SHA-256 113d75e688fb68a2…

MALICIOUS

PDF

88.6 KB Created: 2021-07-20 06:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b94320afccfd93394fcde90394939516 SHA-1: 3810f9eb7694965bd7c480904d4597f325e186ee SHA-256: 113d75e688fb68a211fd061c32d81bfa4137b87bff3de2e2087063c6129518e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to other PDF files hosted on compromised websites, indicating a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e05c65a0a---27730558630.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6ff93ef11e11146ad77e139ddceddcfb/riwivod.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f99464559---kuzufedebolibosagero.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41c1db448---13353362888.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/prdeu4hqqihhoivg1j8g0rqbj3/nimiz.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609925ae6fd9f---18760003641.pdf
    • http://baigeleather.com/userfiles/file/42511129126.pdf
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/11808244183.pdf
    • http://prestopc.it/upload/file/21462449114.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/cfc3003f95c69fef729a24fdf8775659/12973068704.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/134301912160f6371eb5601.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/08e534204aaddd92e8db3e12b2d8f8f4/91048204431.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd98b405f---21505113456.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7d16acc7---dukefedoweraxexekivuxipu.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/4319980107.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929a4c4892---34909607017.pdf
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/vesamawusamizina.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/fikenuwobeweto.pdf
    • https://bazab.ru/ckfinder/userfiles/files/45708087675.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a1793a78f9078b3cf7a15d560c141066/gonetazagiwewu.pdf
    • http://files.ibiza-ferien.de/file/70468925327.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/jaluletotagox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chapter+1+economics+class+10+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f417.bin
970f8dceebf5bf8cdaebfa6a6820a059f418b246cdd86a5e4fe2564225f3f2db
pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 17168 bytes
font_01_sfnt_off0001209e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 16792 bytes
font_02_sfnt_off000138b5.bin
cb12f7cd4e84894d93ba618055fddfacd07af27a86ee15feeb63d99eac827062
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 11316 bytes